Firefighters trying to stop fast-moving Nevada wildfire from spreading to Reno

A wildfire that mushroomed over the weekend in the Sierra Nevada foothills spread perilously close to neighbourhoods in Reno, Nevada, forcing authorities to urge more than 90,000 residents to leave their homes.

The out-of-control fire has already burned some homes, but there is concern that shifting winds could push the flames into newly developed and densely packed neighbourhoods on the edge of Nevada’s second-biggest city.

Schools across the county were closed on Monday because of the evacuations and to keep roads clear for emergency crews.

Authorities said late on Sunday that the Hawk Fire had stayed in its footprint and firefighters were extinguishing hotspots while working to keep the fire from jumping a main road and reaching areas filled with homes and businesses.

The fire began on Saturday and grew to more than 23 square miles (60 square kilometres) on Sunday across foothills ringed by neighbourhoods near the California state line. There was zero containment.

At least six people — three emergency services personnel and three civilians — were injured.

Officials said the fire was “human-caused” but did not say whether it was intentionally set or accidental.

Videos posted on social media showed the smoldering ruins of homes and cars, with only a scorched basketball hoop still standing.

Many residents had little time to evacuate after the fire exploded in size.

“Honestly, I thought it was like in a movie,” Ruby Delatorre, who got back from a concert only to find her home in the evacuation zone, said.

She returned on Sunday to walk to her home and get a few more possessions.

“I literally want to cry and go back for all my stuff. I just got what I thought I needed,” Ms Delatorre said.

Some who spotted the smoke on Saturday thought it was from another wildfire that has been burning over the past two weeks.

Teresa Lenshyn, who is among the evacuees, said being forced to leave was chaotic and stressful.

“You don’t know if the winds are going to shift and it’s going to get worse,” she said.

The Hawk Fire is the third large wildfire in the rugged terrain north of Reno in the past two weeks — all caused by human activity, according to fire officials.

Extremely dry conditions across the American West have sparked a rash of wildfires this summer.

Fires in eastern Washington state forced the evacuation of 60,000 people in the Spokane area in early August.

Nationwide, there have been more than 50,000 wildfires — the most over the past 10 years covering the same time period, according to the National Interagency Fire Centre.